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GB57
12-09-2005, 10:08 PM
I am planning a very light weight glider for back yard use. It will be made of blue FF faom. I have light weight Rx and servos that total under 0.6 oz. I am looking for all up weight around 2 1/2 to 3 oz. What I need is very light weight battery pack for the Rx and servos. LiPo's are plenty light but I think the voltage needs to be 4.8v. What can you recommend and where can I purchase them?

Thanks,

Garry

meatball
12-09-2005, 10:18 PM
theres the battery Great Planes makes for the Fling hand-launch glider, its a rectangle pack, 350 mAH, and 1.2 ounces. Much lighter then Futaba's 250 mAH receiver batts (which are 2 ounces)

Since its so small, Towerhobbies can express ship it for 2.99 so all up price is like 15 bucks.

http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXHBB0&P=M

By the way, the flind hand-launch glider is an excellant plane if you would consider an arf

zbend
12-10-2005, 12:46 AM
Garry
I took apart the Everyready 9V rechargeable. Inside are 6 150 mAh 1.25V NIMH Cells. I usued 3 of them with Electron 6 rec. and 2 Hitec 50 servos in a HL Glider with no problem.

meatball
12-10-2005, 01:55 AM
thats only 3.75 volts! A reciever cant function off that low a voltage can it?

Did you mean you used 4 cells? And also whats the weight.

zbend
12-10-2005, 02:06 AM
The Hitec Electron 6 rec. worked just fine on 3 cells. I just have cheap kitchen scale and the 3 cell weighs about 1oz. If your rec. doesn't work on 3 cells use 4. a little more weight.

savydad
12-10-2005, 04:57 AM
http://www.battlepack.com/close%20out.asp First cell top of page is an N cell, 500mah for .50 each. 3 of these would weigh roughly 1oz, and 4 would be just over 1.25oz (39.2g) plus connector/wiring weight. I've heard the 9v have 6 cells in them, they are an AAAA cell that is VERY hard to find. I have a pen-tablet pc that uses an active stylus that takes this type of cell and that's how I came to find out about the 9v batteries. If you can build your own pack, these cells from battlepack would make a great pack as well.

Todd

savydad
12-10-2005, 05:11 AM
OTOH, if ULTIMATE lightweight is what you want, a KAN180 or the sanyo N50AAA are 3 and 4g each, respectively. This could make a 4 cell pack under 1/2oz, if you want/need something that light. They will be 180mah nimh and 50mah nicd...but 1/3 the weight of the others offered up. Tower used to sell the tiny N50, but it's not on their site. cheapbatterypacks.com sells the tiny kan180 which is 2.83g each...for $1. The sanyo N50 is the same cell used in the popular bit-cars and boats. Not sure how light you wanted so I thought I'd point out some lighter ones.

Todd

GB57
12-10-2005, 05:12 PM
The 1/2 oz pack would be perfect. Thanks for the responses.

Garry

cyclops2
12-10-2005, 09:36 PM
On 1 very small RC boat I used wristwatch batteries. A little pricey but great.

everydayflyer
12-11-2005, 09:18 PM
Some receivers and servos will work of a single LiPoly cell. Examples are Hi Tech Electron 6 and HS 50 and HS 55 servos.


Charles